Capacitor Size

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=50490
Printed Date: May 01, 2024 at 8:41 AM

Topic: Capacitor Size

Posted By: kingpin111
Subject: Capacitor Size
Date Posted: February 20, 2005 at 12:39 PM

my objective:

remove the low frequencies from my 6x9's, and keep the mid and high frequencies.

the guy at the install shop said go to Radio Shack and get-----130 micro feretz(spelling) capacitor.

is this the right rating?

also, the closest i could find to the rating was 100 or 220 micro fetetz would one of these do.

please help i am almost finished my sub box and ready to go, the fat lady is getting ready to sing:D

thanks

KINGPIN

Replies:

Posted By: deocder
Date Posted: February 20, 2005 at 1:07 PM

Check out the first order high pass filter on the following page.

here

Posted By: DYohn
Date Posted: February 20, 2005 at 1:10 PM

OK, a couple of things here. First, the suggestion of using a 130 micro-farad capacitor will create a 6db/octave crossover at about 320Hz assuming your 6X9's are 4-ohm speakers. Products like this, by the way, are also called "bass blockers." 320Hz is quite high, but it will indeed keep the bass out of your speakers. 100 µfd will cross at about 400Hz and 220 µfd will cross at about 200Hz. I'd suggest using a crossover point of 200Hz.

You can use THIS chart, by the way, to see the effect of different crossover components.

Also, you cannot just go to Radio Shack and get any old capacitor. You need a "non-polarized" capacitor rated for at least 100 volts or higher (depending on your amplifier wattage.) I suggest purchasing caps designed for use in crossover networks, like these.

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